State of differentiation of bovine epithelial lens cells in vitro. Modulation of the synthesis and of the polymerization of specific proteins (crystallins) and non-specific proteins in relation to cell divisions

Experimental Cell Research
L SimonneauY Courtois

Abstract

Maintenance of the state of differentiation in serially cultured bovine epithelial lens cells has been investigated. The radioactive labelled soluble proteins were studied by gel filtration and gel electrophoresis. 1. In the lens epithelium on its capsule, preferential synthesis of alpha B2 vs alpha A2 crystallin subunits and synthesis of beta-crystallins (mainly beta Bp) were observed. 2. Epithelial lens cells cultured on plastic Petri dishes for up to 35 divisions still synthesized alpha B2 and beta Bp, but no longer alpha A2. Conversely, the same cells injected into nude mice synthesized alpha B and alpha A, but no beta-crystallin could be detected. 3. The ratio of non-crystallin proteins to crystallin polypeptides increased drastically with the number of cell divisions. Among these proteins, both Mr 45 000 and Mr 57 000 proteins are probably constituents of the water-soluble cytoskeletal proteins, respectively actin and vimentin. A Mr 17 000 polypeptide was observed and its relationship with a metabolic product of alpha-crystallin is proposed. 4. The polymerization process of crystallin polypeptides in these cells was studied and compared with crystallin aggregates found in the lens. Newly synthesized alpha crystallins were...Continue Reading

References

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Citations

Jul 7, 2011·Biogerontology·Alvaro Macieira-Coelho
Dec 1, 1986·Experimental Eye Research·N A Richardson, J W McAvoy
Apr 1, 1985·Proceedings of the National Academy of Sciences of the United States of America·A B ChepelinskyJ Piatigorsky
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Oct 1, 1986·Experimental Eye Research·C E Patek, R M Clayton
Jan 1, 1986·Differentiation; Research in Biological Diversity·J R ReddanE M Goldenberg
Dec 1, 1989·Experimental Eye Research·A GwonM H Garner

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